APA (7th ed.) Zitazioa

National Council of Teachers of Mathematics, U.S.A. (1970). Geometría informal. Trillas.

Chicago Style (17th ed.) Zitazioa

National Council of Teachers of Mathematics, U.S.A. Geometría Informal. Ciudad de México: Trillas, 1970.

MLA (9th ed.) Zitazioa

National Council of Teachers of Mathematics, U.S.A. Geometría Informal. Trillas, 1970.